結果

問題 No.140 みんなで旅行
ユーザー kei
提出日時 2018-08-17 01:37:02
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 10 ms / 5,000 ms
コード長 3,350 bytes
コンパイル時間 1,709 ms
コンパイル使用メモリ 172,996 KB
実行使用メモリ 8,448 KB
最終ジャッジ日時 2024-10-05 08:22:19
合計ジャッジ時間 2,791 ms
ジャッジサーバーID
(参考情報)
judge2 / judge1
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 19
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int INF = 1e9;
const ll LINF = 1e18;
template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; }
template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " "
    ;} return out; }
template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out
    << Mat[i];} return out; }
template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out <<
    it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; }
/*
<url:https://yukicoder.me/problems/no/140>
============================================================
=================================================================
=============================================================
================================================================
*/
const ll MOD = 1e9+7;
const ll MAX_N = 600;
ll Inv[MAX_N];
ll fact[MAX_N];
ll factInv[MAX_N];
void Inv_init(){
Inv[1] = 1;
for(int i = 2; i < MAX_N; i++) {
Inv[i] = Inv[MOD%i] * (MOD - MOD/i) % MOD;
}
}
void fact_init(){
fact[0] = fact[1] = factInv[0] = factInv[1] = 1;
for(int i = 2; i < MAX_N; i++){
fact[i] = (fact[i-1] * i) % MOD;
factInv[i] = (factInv[i-1] * Inv[i])%MOD;
}
}
// a^b % MOD;
ll powmod(ll a,ll b) {ll res=1;a%=MOD; for(;b;b>>=1){if(b&1)res=res*a%MOD;a=a*a%MOD;}return res;}
// 1/a % MOD
ll inversemod(ll a) { return powmod(a,MOD - 2);}
// 1 N N K
ll nCr(int n,int r) {
if(n < r) return 0;
return (fact[n] * (factInv[r] * factInv[n-r] % MOD)) % MOD;
}
// 1 N N K
ll nPr(int n,int r){
if(n < r) return 0;
return (fact[n]*factInv[n-r])%MOD;
}
// 1 N N K
ll nHr(int n,int r){
if(n == 0 && r == 0) return 1;
return nCr(n+r-1,r);
}
void init(){
Inv_init();
fact_init();
}
// ·Nr
ll F[MAX_N][MAX_N];
ll nFr(int n,int r){
return F[n][r];
}
void F_init(){
for(int i = 1; i < MAX_N;i++){
F[i][1] = F[i][i] = 1;
for(int j = 2; j < i;j++){
F[i][j] = (F[i-1][j-1] + j*F[i-1][j])%MOD;
}
}
}
ll solve(){
init();
F_init();
ll res = 0;
int N; cin >> N;
vector<vector<ll>> table(N+1,vector<ll>(N+1));
for(int i = 1; i <= N;i++) table[i][i] = 1;
for(int x = 1; x <= N;x++){
for(int y = 1; y <= x; y++){
(res += nCr(N,x)*nFr(x,y)%MOD*powmod(y*(y-1),N-x))%=MOD;
}
}
return res;
}
int main(void) {
cin.tie(0); ios_base::sync_with_stdio(false);
cout << solve() << endl;
return 0;
}
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